<< ok, then there's no real difference in quality? Same damn thing you'd get with retail, just not the extra crap? >>
There are oem, bare, bulk, most people just use "oem" for all of them, but there are difference.
For example, video card, oem could mean made by 3rd party, could also mean bare card without box, software, same card as the retail version, could also mean bulk pack, with same software as retail but brown/white box.